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Toward Commercialization of Stable Devices: an Overview on Encapsulation of Hybrid Organic-Inorganic Perovskite Solar Cells

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Toward Commercialization of Stable Devices: an Overview on Encapsulation of Hybrid Organic-Inorganic Perovskite Solar Cells crystals Review Toward Commercialization of Stable Devices: An Overview on Encapsulation of Hybrid Organic-Inorganic Perovskite Solar Cells Clara A. Aranda 1,2, Laura Caliò 3 and Manuel Salado 4,* 1 Institute for Photovoltaics (IPV), University of Stuttgart, 70569 Stuttgart, Germany; [email protected] 2 IEK-5 Photovoltaics, Forschungzentrum Jülich, 52425 Jülich, Germany 3 Multifunctional Optical Materials Group, Institute of Materials Science of Sevilla, Consejo Superior de Investigaciones Científicas—Universidad de Sevilla (CSIC-US), Américo Vespucio 49, 41092 Sevilla, Spain; [email protected] 4 BCMaterials—Basque Center for Materials Applications and Nanostructures, UPV/EHU Science Park, Barrio Sarriena s/n, 48940 Leioa, Spain * Correspondence: [email protected] Abstract: Perovskite solar cells (PSCs) represent a promising technology for energy harvesting due to high power conversion efficiencies up to 26%, easy manufacturing, and convenient deposition techniques, leading to added advantages over other contemporary competitors. In order to promote this technology toward commercialization though, stability issues need to be addressed. Lately, many researchers have explored several techniques to improve the stability of the environmentally- sensitive perovskite solar devices. Challenges posed by environmental factors like moisture, oxygen, temperature, and UV-light exposure, could be overcome by device encapsulation. This review focuses the attention on the different materials, methods, and requirements for suitable encapsulated Citation: Aranda, C.A.; Caliò, L.; perovskite solar cells. A depth analysis on the current stability tests is also included, since accurate Salado, M. Toward Commercialization of Stable Devices: An Overview on and reliable testing conditions are needed in order to reduce mismatching involved in reporting the Encapsulation of Hybrid efficiencies of PSC. Organic-Inorganic Perovskite Solar Cells. Crystals 2021, 11, 519. https:// Keywords: perovskite; encapsulation; stability doi.org/10.3390/cryst11050519 Academic Editor: Sergey V. Makarov 1. Introduction Received: 14 April 2021 Perovskite Solar Cells (PSCs) have demonstrated outstanding performance, achieving Accepted: 2 May 2021 power conversion efficiencies (PCE) as high as 25.5% and theoretical efficiencies up to 31%. Published: 7 May 2021 Since the inception of PSCs in 2009 [1], a lot of improvements have been done in various aspects, like composition [2], synthesis technique, fabrication method [3], and interfacial Publisher’s Note: MDPI stays neutral studies [4]. In addition, an even higher PCE can be obtained by combining the two silicon with regard to jurisdictional claims in and PSC devices together, i.e., perovskite/silicon tandem solar cells, by exceeding the published maps and institutional affil- Shockley–Queisser limit [5]. Unfortunately, it is challenging to obtain satisfactory lifetime iations. during PSC operation when compared to that of silicon solar cells. In fact, unlike the silicon solar cells, the instability of hybrid organic-inorganic PSC devices remains a significant bottleneck to commercialization [6]. Currently, PSCs are only stable up to few months at an outdoor environment [7,8], since PSCs are sensitive to harsh environmental condi- Copyright: © 2021 by the authors. tions (see Figure1) such as UV light exposure [ 9], high temperature [10,11], and, most Licensee MDPI, Basel, Switzerland. importantly, oxygen [12] and humidity [13,14]. In the last few years, different approaches This article is an open access article have been explored in order to overcome the mentioned issues. A comprehensive under- distributed under the terms and standing of these issues in PSCs is required to achieve stability breakthroughs for practical conditions of the Creative Commons commercial applications. Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). Crystals 2021, 11, 519. https://doi.org/10.3390/cryst11050519 https://www.mdpi.com/journal/crystals Crystals 2021, 11, 519 2 of 16 Figure 1. Schematic representation of different factors affecting the stability of perovskite solar cells. Sources of Degradation of Perovskite Devices Snaith and co-workers studied the stability of PSCs under UV radiation for the first time [15], demonstrating that perovskite solar cells with TiO2 as photoanode suffered from a rapid decay in photocurrent and power conversion efficiency after encapsulation in a nitrogen atmosphere. The authors showed how an electron–hole pair is formed on TiO2 and the hole in the valence band combines with the electron at the oxygen adsorption site after UV illumination. This might be overcome by introduction of small amount of oxygen, which could decrease the number of empty deep trap sites [15,16]. Another solution to UV degradation of the TiO2 layer was introduced by Komarala and co-workers [17]. The 3+ authors proposed that the deposition of a down-shifting (DS) YVO4:Eu nano-phosphor layer on the reverse side of fluorine doped tin oxide (FTO) glass could improve the PSC stability. In fact, the phosphor layer can absorb UV light and emit visible light, which could be absorbed by the underlying perovskite layer. The device showed an improvement in stability under prolonged illumination, retaining more than 50% of its initial efficiency, whereas for PSCs without the phosphor layer, the efficiency diminished to 35% of its initial value [16,17]. On the other hand, temperature enhancement under continuous sun illumination can produce phase changing and instability in the perovskite layer [18]. Connings et al., ◦ studied the thermal stability of ITO/TiO2/perovskite set up at 85 C in order to focus on the absorber layer of the PSCs [19]. Results revealed a high amount of deterioration in the ambient environment than in the presence of nitrogen and oxygen. Pisoni and co-workers showed that MAPI (CH3NH3PbI3) had a very low thermal conductivity for both large single crystals and the polycrystalline form. This meant that the light-deposited heat inside the perovskite itself could not spread out quickly, which caused mechanical stress and limited the lifetime of the photovoltaic devices [20]. Also, studies conducted by Pister et al., stressed the fact that the annealing temperature of MAPI film is important for both thermal stability and efficiency of PSCs, with an ideal temperature range to carry out annealing of MAPb(I/Cl) perovskite between 100 and 150 ◦C[21]. Furthermore, oxygen represents a crucial environmental parameter related to PSC stability, both during perovskite film preparation and subsequent device exposure. Haque and co-workers showed that photodegradation reaction of MAPI film is triggered by the action of active oxygen species (superoxide O2−) on the organic component (i.e., methy- lammonium) of the perovskite absorber layer [22]. Lately, also Maier and co-workers demonstrated that since MAPI shows a certain oxygen solubility, and that O2, once in- troduced, acts as an acceptor dopant owing to O2− replacing I− or being accommodated interstitially. Under these conditions, MAPI is thermodynamically expected to degrade, forming water and iodine [12]. On the other hand, it has been proved that oxygen passi- vation could enhance the photoluminescence (PL) intensity of the perovskite due to the decrease of the non-radiative recombination. Lately, it has also been demonstrated that if perovskite layer is exposed to oxygen by exclusion of light illumination, the halide vacancies could be passivated by oxygen Crystals 2021, 11, 519 3 of 16 atoms, meanwhile, the reaction between oxygen molecule and photogenerated electrons might be prevented, which will lead to the improvement of both efficiency and stability for PSCs [23,24]. Apart of the degradation sources cited above, it is now well established that PSCs are very susceptible to high humidity. The degradation is notably quicker under high humidity conditions, as demonstrated by Zhu et al. [25] by performing stability tests under constant illumination over a short time period in an N2 glovebox to prevent the intrusion of humidity. In order to get over the above-cited problems, many solutions have been addressed in order to improve the stability. For instance, compositional tuning of perovskite materials has been well explored over recent years. For example, it has been demonstrated that the incorporation of different organic and inorganic cations (like cesium, formamidinium, and rubidium) in the structure is beneficial to internal perovskite stability [2,26]. However, phase segregation due to temperature changes can induce instabilities inside the perovskite structure depending on the composition. Table1 summarizes the phase stability of common perovskite compounds. %clearpage Table 1. Summary of the different crystal structure depending on the composition and the temperature of the per- ovskite material. Non-Optical Perovskite Low T Medium T High T Ref. Active <162.2 K 162.2–327.4 K MAPbI >327.4 K (cubic) [27] 3 (orthorhombic) (tetragonal) 149.5–155.1 K 155.1–236.9 K MAPbBr >236.9 K (cubic) [28] 3 (tetragonal) (tetragonal) 140–285 K Pure FAPbI <438 K (hexagonal) >285 K (cubic) [29] 3 (tetragonal) <588 K CsPbI >588 K (cubic) 3 (orthorhombic) <257–283 K <298 to >523 K FAxMA PbI forms if x > 0.85 [30,31] 1-x 3 (cubic) (tetragonal) <398 K, x = 0.85 >398 K, x = 0.85 Mixed FAxCs1-xPbI3 [32] A-cation (hexagonal) (tetragonal) 298 K, tetragonal for x ≤ MAPb(I Br ) [33] 1-x x 3 0.13, cubic for x ≥ 0.2 298 K, trigonal for x < amorphous phase Mixed FAPb(I Br ) 0.3, cubic for x > 0.5, [34] X-anion 1-x x 3 for x = 0.3 to 0.5 possibly metastable FA0.83Cs0.17Pb(I1-xBrx)3 298 K, (cubic) [35] FA0.75MA0.15Cs0.10Pb(I0.83Br0.17)3 298 K (cubic) [36] 298 K (not anion Mixed cation- FA MA Cs Rb Pb(I Br ) [37] 0.75 0.15 0.05 0.05 0.83 0.17 3 specified) Also, the addition of additives in both perovskites, or the charge selective layers, was largely investigated. For instance, the use of hydrophobic ionic liquid have been proved to be effective in order to both enhance device stability and efficiency [38].
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